In this episode, Jon Castelli and Aron Forbes break down their collaborative mixing process, revealing the sonic secrets behind Billie Eilish’s chart-topping hit “BIRDS OF A FEATHER.” Follow them in the studio for an in-depth look at their signature tools, philosophies, and engineering techniques.
John and Aron begin with an overview of their team dynamics and studio workflow. Both are respected engineers in their field and demonstrate the value that collaboration can bring to the mixing process. Explore their approach to session preparation, signal levels, and critical listening as they break down the basics of their mixing routine.
Learn about the subtle enhancements used to highlight Billie’s unique vocals, as well as more aggressive treatments that add energy to the percussion and low frequencies. Viewers will learn new techniques for improving depth, rhythm and dynamics, with an emphasis on understanding the subtle differences between tube, tape and transformer saturation.
Content
- Parts 1-8
- Subs (ENG, SPA, FRA)

- Download [Mix With The Masters] Jon Castelli, Aron Forbes Mixing ‘Birds of A Feather’ by Billie Eilish [2025, ENG + Multi Sub]
- Original Publisher: Mix With The Masters
- Category: Video lesson
- License type: Full
- Download Size: 2.18 GB